Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies (Narrative) (Details)

v3.7.0.1
Commitments and Contingencies (Narrative) (Details)
$ in Thousands
6 Months Ended 12 Months Ended
Jul. 29, 2016
defendant
Feb. 09, 2016
defendant
Mar. 11, 1997
Jul. 29, 2016
claim
Dec. 31, 1997
USD ($)
well
Mar. 31, 2017
USD ($)
well
Mar. 31, 2016
USD ($)
Commitments [Line Items]              
Plugging and abandonment escrow account on the WCBB properties (Note 10)           $ 3,100  
Number of claims filed | claim       2      
Judicial District Court for the Parish of Cameron              
Commitments [Line Items]              
Number of defendants | defendant   26          
Judicial District Court for the Parish of Vermillion              
Commitments [Line Items]              
Number of defendants | defendant 40            
WCBB              
Commitments [Line Items]              
Purchasing remaining percent interest In oil and gas property, percent         50.00%    
Payments held for restricted cash         $ 18    
Significant plugging commitment minimum number of wells to be plugged | well         20    
Tenure of minimum wells to be plugged     20 years        
Number of wells plugged | well           513  
Loss on long-term purchase commitment | Muskie Proppant LLC              
Commitments [Line Items]              
Long-term purchase commitment, accrued damages , amount           $ 0 $ 1,300